20715589 has 2 divisors, whose sum is σ = 20715590. Its totient is φ = 20715588.

The previous prime is 20715581. The next prime is 20715623. The reversal of 20715589 is 98551702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 58564 = 4545^2 + 242^2 .

It is a cyclic number.

It is not a de Polignac number, because 20715589 - 2³ = 20715581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20715581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10357794 + 10357795.

It is an arithmetic number, because the mean of its divisors is an integer number (10357795).

Almost surely, 2^20715589 is an apocalyptic number.

It is an amenable number.

20715589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20715589 is an equidigital number, since it uses as much as digits as its factorization.

20715589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 20715589 is about 4551.4381243734. The cubic root of 20715589 is about 274.6412467900.

The spelling of 20715589 in words is "twenty million, seven hundred fifteen thousand, five hundred eighty-nine".